Impulse and wave transmission system



April 26, 1932. s GQRTON 1,855,601

IMPULSE AND WAVE TRANSMISSION SYSTEM Filed Aug. 26, 1930 2 Sheets-Sheetl a: ll mm T0 RE CE/VERS r13 125w UP I III 190' /N VEN TO/P By WSGORTON')kJM , TTO/PNEY April 26, 1932. w. s. G ORTON IMPULSE AND WAVETRANSMISSION SYSTEM Filed Aug. 26, 1950 2 Sheets-Sheet 2 By W5. GORTONATTORNEY Patented Apr. 26, 1932 UNITED sr was PAIENT j wILnIA'Ms:eonron, oFiEAs'r-omnen NEW JERSEY; ASSIGNdItTOBEnnf-rmnPHoNEi-LABORATORIES, INCOR-PORATED," FNEW' YORK? N; A3 OORPORAT'ION on NEW YORKIMPULSE'AND'WAVE TRANSMISSION SYSTEM Application-filed smudge, 1930.Serial No ;-47-7,8802

Thisinvention relates: to communication range than can'be done Where thetransmis sion'is carried on exclusively bymeans'ofwro tary distributorapparatus.-

Another. ob ect is to provide. for the" syn-- chronization of carrierfrequency scircuits Without the transmission of any carrier frefrequencies: e'xtendingrfrom to 125'ucyclesv 5? thev modulating 3 quencycurrentover;the -'line.-

From a generlcaspect: Waves of the carrier portion of the system mayhave any Wave form: andmay-represent signals by any desiredsignallinglcode; How- Y ever, ,in the system herein described carrierWavesare modulated bytelegraph-impulsesfrom printinghtelegraphr sendersWhich-impulses: are: transmitted-over rotary" distribu tOIS'.

with the-accompanying drawings; In; the. drawings,

Fig. 1 represents-a? schematic" circuittdiaegram of atransmittingfstation;

Fig. 1"-A annodification thereof; and. Fig; 2, a similardiag-ramof areceiv'ingzsta tion.

The circuit of l is representediasi transmitting to the stationoof'i2.i=over. a

duplex line; but the essentialiprinciples of the: invention v may be:practicediii: onewvay systems aswell as-duplex systems.

; In Fig:11 the rotatingishaft'l isrdriven' 'byu a La Cour. motor 12havingiits terminal a; a

connected to'any suitablesource of constant frequency current such; asis known: 1mm: art. The shaft lzdrives ithe'brush armiof the: 451synchronous distributor- 3; The contact's of" a I group of: printing;telegraph sendersi T1;

Further objects and==feati1res-ofi the: invention will appear-:from-a:p-erusal o-f the follow: ing detailed description read in connectionsmita range of frequencies-appropriate:t-o the telegraph" signalstransmitted from the .tra ns-- mit-ter's Tl',v 1 2,1 etc The linerinthisgcase isv indicated as asubmarine cable- 4: The ratio arms 5: and;the balancing network Gare of:v the usual type. 'Elieyimay be Dmifitdgima system 1 wherein transmissiom takes place in onlylone direction ata'time. The -apparatus" so far described is of a more or lessvconve'ntional'type. Leeitnow be supposed tlfatithe 1, signals transmitted fromthetransmitters? T1,; T2, do not occupy the: total frequencyrangeravailab le on the cable-A. Foraexample; s: let itbe assumedthatthey occupy; a ran'geof:

and thata range of -a" few hundred? cycl'es;.: more or lessyabovethis:range'is available fora telegraph transmission.- (Alb frequen'--' cies*given herein 1 are incomplete cycles: pen secondly. The=-apparatus-about to horde scribed is intended to make use of'i'therest"of the available frequency range: v

The shaft 1 carries an alternating: currentgenerator 6=whichsupplies -the?input circuit v V of a harmonic generat'or' H'Gir Tha -generator? 73*6 andzthe'harmonic generator tiypifyaany 1' suitable": apparatus drivenby: the: shaft ilxt'o supply snitablefcarrier frequencies as wiilibeidescribed in What followse- Acrfrequencyiof? I cycles is "supplied"through the circuit'fl to the carrierssuppression vacuum: tubemodu'lator circui-t 8.- A suitableifilter EQ selectsatlfezfrequency of125 cycles-from? the outputzof' the harmonic generatorHGi Asuit'ableotlier selective circuit: F9'a 1 selects another suitable? as carrier:frequency; for example-p cycles; transmitted-throughthe circuit7a toaearrierf suppression modulatingi'circuit 8a; Gircuits 8 vand'f8a maybesupplied with modulating: v impulses on signals zfrom any. desiredsignal- '6 ingr source; In the-present system impulses from a suitable ql rality of transmitters GT1 and' GTQ are transmitted over v a rotary"distributor l0 'toithe input circuit" of th'e modulating circuitfii. Acondenser lids-pref; 9'5 erably included in the circuit i'conne'ctin'the rotary distributor 1 0 itO th'e circuit '82 3 15am; r output:circuit' 0f the circuit 8 is ear new de signed F to: transmit a: rangeof frequencies from 125cycles:tozl90 cyclesb Thisir ange is 100 theupper side-band which results from modulation of a 125 cycle wave withimpulses proceeding from the transmitter GT1 and GT2. The lowerside-band is assumed to be suppressed by thefilter F12.

Other filters F12a etc. serve to pass the waves proceeding from othermodulators 8a, etc. which are supplied with modulating impulses fromother series of transmitters CTlct, Urea, etc. overrotary distributors10a etc. A filterF 13 is connected between the filter F12, F12a, etc.and the line. Filter F13. serves to tra'nsmit'all frequencies essentialto the system above 125 cycles. Filter F 13 is not essential and may beomitted.

In the modified form of circuit illustrated in Fig. 1A the generator 6is a multi-fre quency generator of a type well known in the art. Itsupplies currents of the frequencies of 125 cycles, 190 cycles etc. to aplurality of amplifiers A, A1 which in turn apply them to the carriersuppression modulators 8, 8a etc. The rest of the system is the same asthat of Fig. 1.

At the receiving end of thesystem shown in Fig. 2 waves of frequenciesbetween Oand 125 cycles are selected by the filter F1 1- and transmittedto a shaping and amplifying circuit 15. Theoutput circuit of the circuit15 is connected to a polar relay 16 whose contacts control theapplication of positive and negative battery to the ring and associatedseg ments of a distributor 17. To the segments of distributor 17 areconnected the printer magnets of the series of receivers R1, R2,

P1, P2, etc.

The polar relay 18 is a synchronizing relay corresponding in function tothe relay 13 of Knoop Patent 1,747,248 February 18, 1930.

; The La. Cour motor 19 drives the shaft 1. It

is assumed that the-relay 18 is connected to synchronizing apparatus fordriving and synchronizing the La Cour motor 19 in the same manner as therelay 13 in Patent1,747,-

I 248 is connected to the motor 5 in that patent.

Conductor C18 corresponds to conductor 56 of the'patent and relay R19corresponds to relay 43 of the patent.

The elements 18 and R19 typify any suitable sort of driving andsynchronizing mechanism. If the means for maintainin synchronismconsists ofa Corrector working on a differential gear, arrangement it isconsidered essential for the purpose of the inven- I tion thatthedifferential gear be not located between the enerator 6 and therotary dis tributor l7. it should be connected between the La Cour motor19 and the apparatus driven thereby. With this limitation in mindpractically any sort of correcting or synchronizing arrangement keepingthe rotary distributor 17- of the receiving station in synchronism withthe rotary distributor 3 of the transmitting station may be employed.

The shaft 1 drives the generator 6.. The

generator 6 supplies a harmonic generator HG in the same manner as thecorresponding generator at the transmitting station to produce waves of125 cycles, 190 cycles, etc. These waves are selected by suitableselecting circuits F9, and F9a and supplied to demodulating circuits D,D1, etc. which are of a well known character.

Waves of frequencies above 125 cycles arriving over the cable 4 areconveyed by the circuit 20 to a series of selective filters. F12, F12a,F126, etc. Filter F12 selects a range of frequencies of from 125 to 190cycles, filter F12a selects a range of frequencies of from 190 to 265cycles, other filters select other suitable ranges of frequencies forapplication to their respective demodulating circuits D1, D2, etc.

'Each demodulating circuit has its output connected to receivingapparatus suitable for receiving demodulated waves. Thus, the circuit Dhas in its output a polar relay 21 which controls the application ofpositive and negative impulses over a rotary distributor 22 to printermagnets of a series of printers CP, CPl, etc. Another suitable series ofprinters CPa and CPla is connected over distributor 22a to the outputcircuit of the demodulator D1, and still other series to the outputcircuits of other demodulating demodulators if other demodulators areprovided in the system.

Generator 6 in the'arrangement illustrated is driven at the same numberof revolutions per unit of time as the brush arm of its associateddistributor 3 or 17, as the case may be. However, if the generator 6does not revolve sufficiently rapidly a gear may be introduced betweenthe generator and the distributor brush to increase the relative speedof revolution of the generator to any desired amount. The La Cour motor,the generator 6, and the distributor may be'located in any desired orderalong the shaft so that the gear will not be interposed between the LaCour motor and the distributor. The power produced by the generator 6may be quite small because this power can be increased to any desiredamount in the output circuit of the harmonic generator HG.

In the operation of the system the brush of distributor 17 is kept insynchronism with the brush of distributor 3 except for small phasevariations. By the use ofmodern correction systems thisphase variationmay be reduced to quite infinitesimal proportion. A correcting systemsuitable for doing this is illustrated, for example, in Patent 1,747,248referred to above. Consequently,-the generator 6 at the transmitting andreceiving stations respectively are kept in synchronism. This results inthe various sources of carrier oscillation being likewise kept insynchronism with the corresponding sources at the opposite end of thesystem. Thus, for example, the 125 cycle carrier wave supplied to thedemodulating circuit D is in synchronism with the 125 cycle carrier wavesupplied to the modu lating circuit 8 at the transmitter. The distributor 22 is synchronized with the distributor 10, and the distributor22a with distributor 10a by the signal impulses passing beplurality oftransmitters T1, T2 be employed, although in practice this may be themost convenient way of utilizing the available frequency range.Likewise, it is not essential that the input circuit, or any particularmodulating circuit such as the circuit 8, be supplied by a plurality ofprinting telegraph transmitters TTl, TT2, etc. Single synchronized orunsynchronized transmitters of any suitable known kind may take theplace of each of the series of transmitters.

What is claimed is:

1. In a system for the communication of intelligence, an impulsetransmitter at a transmitting station, an impulse receiver at areceiving station, each of said stations being provided with a rotarydistributor for distributing the impulses to be transmitted or receivedrespectively, and synchronizing means whereby the distributor at thereceivr ing station is kept in synchronism with the distributor at thetransmitting station, in combination with a carrier wave transmissionsystem, said system comprising a source of carrier frequencyoscillations at each terminal, one of said sources at one terminal beingcontrolled in frequency and phase by one of said distributors located atthe station whereat the source is located, and the other of said sourcesbeing controlled by the distributor located at the other end of thesystem whereat the other distributor is located.

2. In a multiplex telegraph system, distributors at remote points in thesystem, driving means and synchronizing means for said distributors,carrier current generators one located at each distributor, a signalingsource associated with one of said generators, signal receiving meansassociated with the other of said generators, and mechanical cou- Vpling means for maintaining a definite periodic relation between thewaves produced by each of said generators and the driving means of thedistributor located thereat.

3. A communication system comprising synchronized rotary distributors atopposite lating means for modulating the carrier waves with waves orimpulses representing signals to be transmitted at the transmitting endand demodulating apparatus for demodulating the modulated waves at thereceiving end.

4:. A submarine cable system comprising a synchronous distributorcommunication channel consisting of elements for transmitting over aline'di'rect current impulses representing messages and elements forreceiving the impulses, a carrier wave communication channel, saidcarrier wave communication channel including devices for producing oneor more carrier waves, one or more separate sets of apparatus forproducing signaling impulses, devices for modulating the one or morecarrier waves with the signaling impulses and transmitting them oversaid signaling line, and elements whereby a distributor of saidsynchronous distributor communication channel and said devices forproducing carrier waves are maintained in a fixed phase relation.

5. In a communication system a device for generating carrier wavesdriven by a shaft upon which is mounted a rotating element of asynchronous distributor, mechanism, for transmitting signaling impulsesto said synchronous distributor, and separate means uncontrolled bysaidmechanism for transmitting over a path other than said distributor,other signaling waves or impulses to said carrier waves, and devices formodulating said carrier waves by said other signaling waves or impulses.

In witness whereof, I hereunto subscribe my name this 25 day of August,1930.

WILLIAM S. GORTON.

terminii of the system, sources of carrier waves at opposite terminii ofthe system, each controlled in phase and frequency by associatedsynchronous distributors, andmodu-

